I think this comments section is amazing in that it's basically one collective "finally, a main character that isn't unrealistic in either direction". It's hard proof that the average reader who enjoys isekai in manga/WNs/LNs really is that starved for a normal character and situations that feel believable, despite the fact isekai protagonists are supposed to be "normal" when they start out.
Uhm, clearing the misunderstanding AFTER sleeping with her is definitely scummy, but somehow fits his "I don't give a shit and take what I want" character. Fortunately, she was ok with it and resigned herself to her fate of being part of his harem, so all was good in the end.
Anyway, I laughed out loud when I read these panels where he just accepted her offer and THEN cleared up the misunderstanding.